polyhalite

例句：

1. 1. Polyhalite is a mineral that can be found in the earth's crust.
   聚卤石是一种可以在地球地壳中找到的矿物。
2. 2. The polyhalite crystals are known for their unique luster and color.
   聚卤石晶体以其独特的光泽和颜色而闻名。
3. 3. Polyhalite has been used as a natural preservative in food storage.
   聚卤石被用作食品储存的自然防腐剂。